CN106316447B - A kind of rice husk Quito hole silicon carbide ceramic material and preparation method thereof - Google Patents
A kind of rice husk Quito hole silicon carbide ceramic material and preparation method thereof Download PDFInfo
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- CN106316447B CN106316447B CN201610617099.9A CN201610617099A CN106316447B CN 106316447 B CN106316447 B CN 106316447B CN 201610617099 A CN201610617099 A CN 201610617099A CN 106316447 B CN106316447 B CN 106316447B
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- rice husk
- silicon carbide
- ceramic material
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- carbide ceramic
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- 235000007164 Oryza sativa Nutrition 0.000 title claims abstract description 96
- 235000009566 rice Nutrition 0.000 title claims abstract description 96
- 239000010903 husk Substances 0.000 title claims abstract description 70
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 45
- 229910010293 ceramic material Inorganic materials 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 240000007594 Oryza sativa Species 0.000 title 1
- 241000209094 Oryza Species 0.000 claims abstract description 95
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 41
- 150000001875 compounds Chemical class 0.000 claims abstract description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 16
- 235000013312 flour Nutrition 0.000 claims abstract description 15
- 239000003054 catalyst Substances 0.000 claims abstract description 10
- 239000007767 bonding agent Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 15
- 239000000758 substrate Substances 0.000 claims description 13
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 7
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- 238000001035 drying Methods 0.000 claims description 5
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- 229920001353 Dextrin Polymers 0.000 claims description 4
- 108010010803 Gelatin Proteins 0.000 claims description 4
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 4
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 4
- 239000003830 anthracite Substances 0.000 claims description 4
- FYGDTMLNYKFZSV-MRCIVHHJSA-N dextrin Chemical group O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)OC1O[C@@H]1[C@@H](CO)OC(O[C@@H]2[C@H](O[C@H](O)[C@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O FYGDTMLNYKFZSV-MRCIVHHJSA-N 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 4
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- 239000008273 gelatin Substances 0.000 claims description 4
- 235000019322 gelatine Nutrition 0.000 claims description 4
- 235000011852 gelatine desserts Nutrition 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
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- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 3
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- 239000002994 raw material Substances 0.000 abstract description 15
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- 230000000694 effects Effects 0.000 abstract description 2
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- 239000000203 mixture Substances 0.000 description 16
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- 238000011065 in-situ storage Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Inorganic materials [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- PFRGGOIBYLYVKM-UHFFFAOYSA-N 15alpha-hydroxylup-20(29)-en-3-one Natural products CC(=C)C1CCC2(C)CC(O)C3(C)C(CCC4C5(C)CCC(=O)C(C)(C)C5CCC34C)C12 PFRGGOIBYLYVKM-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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- 235000019750 Crude protein Nutrition 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- SOKRNBGSNZXYIO-UHFFFAOYSA-N Resinone Natural products CC(=C)C1CCC2(C)C(O)CC3(C)C(CCC4C5(C)CCC(=O)C(C)(C)C5CCC34C)C12 SOKRNBGSNZXYIO-UHFFFAOYSA-N 0.000 description 1
- 229910003978 SiClx Inorganic materials 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 239000003546 flue gas Substances 0.000 description 1
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- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 231100000252 nontoxic Toxicity 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
- NOTVAPJNGZMVSD-UHFFFAOYSA-N potassium monoxide Inorganic materials [K]O[K] NOTVAPJNGZMVSD-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- 239000011775 sodium fluoride Substances 0.000 description 1
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- 229910052682 stishovite Inorganic materials 0.000 description 1
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- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Abstract
The invention discloses a kind of rice husk Quito hole silicon carbide ceramic material and preparation method thereof.Rice husk Quito hole silicon carbide ceramic material, is mainly made up of rice husk and compound, and the quality of compound is the 30%~70% of rice husk quality；The compound is made up of the component of following mass percent：Silica flour 1%~30%, carbon source 5%~40%, catalyst 1%~15%, bonding agent 30%~75%.The present invention rice husk Quito hole silicon carbide ceramic material, using agricultural residue rice husk as primary raw material, blank is made after being mixed with silica flour, carbon source, catalyst, bonding agent, through be molded, dry, burn till it is obtained；Raw materials used wide material sources, cost are cheap, resulting product has the advantages that big porosity height, mechanical strength, good filtration effect, thermal shock resistance is excellent, air vent aperture is fine and microscopic appearance is adjustable, with wide development space and application prospect, it is adapted to industrial application.
Description
Technical field
The invention belongs to technical field of ceramic material, and in particular to a kind of rice husk Quito hole silicon carbide ceramic material and its system
Preparation Method.
Background technology
Porous silicon carbide ceramic material has strong good heat-insulation effect, filterability, high temperature resistant, resistant to corrosion, intensity height, anti-thermal shock
The features such as property is excellent, is widely used in the fields such as insulation, the purification of high-temperature flue gas and the filtering of molten metal.At present,
The preparation of porous silicon carbide ceramic material is consolidated often using carborundum as primary raw material, and by adding combustible method pore-forming through high temperature
Phase reaction sintering is prepared.But because of carbofrax material price costly, and with stronger covalent bond (about 88%), make
Its High temperature diffusion coefficient is relatively low, and C and Si self-diffusion coefficient is only 1.5 × 10 respectively at 2100 DEG C-10cm2/ s and 2.5 × 10-13cm2/ s, cause its firing temperature higher, prepare cost and be difficult to reduce, the industry for limiting porous silicon carbide ceramic material pushes away
Wide and application, it is to realize its industrialization that low cost and the preparation method of easy-to-use porous silicon carbide ceramic material are found for this
The key of popularization and application.
Rice husk is the byproduct of Rice producing, accounts for the 20% of paddy weight, and the current global paddy place of production is concentrated mainly on
Asia, wherein, China's paddy annual production is about 200,000,000 tons, and it is about 0.4 hundred million tons to be converted to rice husk annual production, accounts for Gross World Product
More than 30%, rank the first in the world.But in the vast rural area in China and Liang meter processing factories, rice husk is by burning or stacking naturally mostly
Handled, both polluted surrounding enviroment, hidden disaster hidden-trouble in the hiding, also taken up large amount of land resources.Research shows that rice husk is a kind of
Porous, low-density (720kg/m3) natural organic, by crude fibre, lignin, crude protein, crude fat and ash content structure
Into its mass percent respectively may be about 40%, 34%, 4%, 1% and 21%, in ash content, SiO293.1% is accounted for, remaining is
A small amount of K2O, Na2O, MgO and Al2O3Deng.It follows that include two kinds of elements of C and Si simultaneously in rice husk, and impurity content compared with
It is low.Therefore, using rice husk as raw material, while its Si matter and C matter ingredient in situ synthesizing silicon carbides are utilized, is expected to substantially reduce porous carbon
The preparation cost of SiClx ceramic material, and rice husk waste resource is effectively utilized, have to the Green Development for promoting industry, agricultural
Great significance.
CN103803982B discloses a kind of preparation method of rice husk accumulation porous silicon carbide, and it will be impregnated with phenolic resin
Rice husk drying after accumulation molding, obtain carbonized product through 300~1300 DEG C of carbonizations under vacuum condition, then by carbonized product and
Porous silicon carbide ceramic is made in 1420~1750 DEG C of silication in silica flour；This method can obtain porosity be 30%~70% it is more
Hole or properties of SiC foam ceramics, but it does not make into one to the morphology of pore-size distribution, mechanical strength and carborundum
Step explanation, and vacuum condition is needed, technical conditions are complex, and practical ranges are limited.
The content of the invention
It is an object of the invention to provide a kind of rice husk Quito hole silicon carbide ceramic material, it has, and aperture is fine, volume is close
Spend the characteristics of low, high mechanical strength, filterability are good, high comprehensive performance.
Second object of the present invention is to provide the preparation method of above-mentioned rice husk Quito hole silicon carbide ceramic material.
In order to realize the above object the technical solution adopted by the present invention is：
A kind of rice husk Quito hole silicon carbide ceramic material, is mainly made up of rice husk and compound, and the quality of compound is rice
The 30%~70% of chitin amount；The compound is made up of the component of following mass percent：Silica flour 1%~30%, carbon source 5%
~40%, catalyst 1%~15%, bonding agent 30%~75%；Wherein carbon source is carbon black, graphite, graphene, phenolic resin
One kind or combination in powder, anthracite, coke or pitch.
Above-mentioned rice husk Quito hole silicon carbide ceramic material, is made up of rice husk, compound and water.
The bulk density of rice husk is relatively low, and real density is about 720kgm-3, natural deposited dry density is only 96~160kg
m-3, using it as primary raw material, can effectively reduce the proportion of product.
The catalyst is NaCl, NaF, Zn, Fe, FeCl3、Fe2O3In one kind or combination.
The bonding agent be dextrine powder, pulp powder, carboxymethyl cellulose, sodium carboxymethylcellulose, polyvinyl butyral resin,
One kind or combination in gelatin.
In above-mentioned raw materials, Si weight/mass percentage composition >=98% in silica flour；The weight/mass percentage composition of carbon in carbon black >=
98.3%；Weight/mass percentage composition >=98.5% of carbon in graphite；Weight/mass percentage composition >=96% of carbon in graphene；Phenolic resin
The weight/mass percentage composition of residual carbon is 60%~68% in powder；Weight/mass percentage composition >=95.5% of smokeless carbon content in coal；In coke
The weight/mass percentage composition of carbon is 95%~98%；The weight/mass percentage composition of carbon is 40%~45% in pitch.
Rice husk Quito hole silicon carbide ceramic material of the present invention, is mainly made up of rice husk and compound, contains simultaneously in rice husk
There are two kinds of elements of Si and C, and Si elements are unformed shape, have higher reactivity, and generation SiC is easily reacted with C, makes to burn till
Temperature reduces；Catalyst promotes high―temperature nuclei reacting balance to carry out；Bonding agent makes each raw material components fully soak and bond, and improves
Blank strength, reduce product defect.Each raw material components proportioning science, synergy, make gained rice husk base porous silicon carbide ceramic
The air vent aperture of material is fine, bulk density is low, and has higher mechanical strength.
Blank will be prepared by mixing into compound after powdered rice hulls plus water wetting, then through being molded, dry and bury carbon under the conditions of
High temperature is burnt till, and produces porous silicon carbide ceramic material.
Preferably, the preparation method of above-mentioned rice husk Quito hole silicon carbide ceramic material, comprises the following steps：
1) powdered rice hulls are mixed with water, adds compound and be well mixed, blank is made；
2) blank is molded and base substrate is made, after body drying, burnt till, produce in 1300~1500 DEG C in reducing atmosphere.
In step 1), the dosage of water is the 20%~200% of powdered rice hulls weight.Average grain diameter≤75 μm of powdered rice hulls.It is mixed
Close in material, average grain diameter≤75 μm of silica flour, average grain diameter≤75 μm of carbon source, average grain diameter≤45 μm of catalyst.
In step 2), described being shaped to is compressing, and the pressure of shaping is 0.5~3MPa, pressurize under briquetting pressure
Time is 10~30s.
In step 2), dry temperature is 50~110 DEG C, and the dry time is 12~48h.
In step 2), 1300~1500 DEG C are warming up to 2~5 DEG C/min speed, and 3 are incubated in maximum sintering temperature~
5h。
Described reducing atmosphere is to bury the reducing atmosphere under the conditions of carbon.
The preparation method of rice husk Quito hole silicon carbide ceramic material of the present invention, with cheap and sufficient source agricultural
Waste material rice husk is that primary raw material is prepared into porous silicon carbide ceramic material, reduces firing temperature, substantially reduces preparation cost,
And effective utilization of waste resource is realized, the added value of rice husk is improved, reduces environmental pollution, is advantageous to energy-conserving and environment-protective.
The preparation method technique is simple and easy to control, cost is cheap, nontoxic pollution-free, green, has wide development space and application
Prospect, it is adapted to industrial application.
Brief description of the drawings
Fig. 1 is the SEM figures of carborundum in the gained rice husk Quito hole silicon carbide ceramic material of the embodiment of the present invention 1；
Fig. 2 is the SEM figures of carborundum in the gained rice husk Quito hole silicon carbide ceramic material of the embodiment of the present invention 2.
Embodiment
With reference to specific embodiment, the invention will be further described.
In following examples, by rice husk and water by volume 1:5 ratio is cleaned 3 times, is removed its surface silt, is obtained clean
Net rice husk；Grinding, sieving, make its average grain diameter≤75 μm, it is standby to obtain powdered rice hulls after clean rice husk is dried；
In carbon source, graphite, carbon black, graphene, phenol-formaldehyde resin powder, anthracite, coke, pitch particle diameter≤75 μm, carbon
Weight/mass percentage composition >=98.3% of black middle carbon；Weight/mass percentage composition >=98.5% of carbon in graphite；The quality of carbon in graphene
Percentage composition >=96%；The weight/mass percentage composition of residual carbon is 60%~68% in phenol-formaldehyde resin powder；The quality of smokeless carbon content in coal
Percentage composition >=95.5%；The weight/mass percentage composition of carbon is 95%~98% in coke；The weight/mass percentage composition of carbon is in pitch
40%~45%；
Si weight/mass percentage composition >=98% in silica flour, average grain diameter≤75 μm of silica flour；
In catalyst, NaCl, NaF, Zn, Fe, FeCl3、Fe2O3The average grain diameter of powder≤45 μm.Above-mentioned raw materials are city
Sell customary commercial.
Embodiment 1
Rice husk Quito hole silicon carbide ceramic material of the present embodiment, is prepared by rice husk, water and compound, compound
Quality is the 40% of rice husk quality；The compound is made up of the component of following mass percent：Silica flour 26%, graphite 37%,
NaCl 6%, dextrine powder 31%；Take raw material to mix 1h in ball mill mixing machine by proportioning, produce compound.
The preparation method of rice husk Quito hole silicon carbide ceramic material of the present embodiment, using following steps：
1) powdered rice hulls are added in mixer, adds the water of powdered rice hulls weight 45%, stirring makes powdered rice hulls fully drench；Again
Compound is added, blank is made in stirring 5min；
2) blank is subjected to mechanical pressing under low pressure, briquetting pressure 1MPa, dwell time 20s, obtains base substrate；Will
Base substrate dries 15h at 110 DEG C, is then warming up in the reducing atmosphere under the conditions of burying carbon with 2.5 DEG C/min speed
1400 DEG C and 3h is incubated, produced.
Embodiment 2
Rice husk Quito hole silicon carbide ceramic material of the present embodiment, is prepared by rice husk, water and compound, compound
Quality is the 65% of rice husk quality；The compound is made up of the component of following mass percent：Silica flour 2%, carbon black 40%, Fe
3%, Fe2O35%, dextrine powder 28%, gelatin 22%；Take raw material to mix 1h in ball mill mixing machine by proportioning, produce compound.
The preparation method of rice husk Quito hole silicon carbide ceramic material of the present embodiment, using following steps：
1) powdered rice hulls are added in mixer, adds the water of powdered rice hulls weight 57%, stirring makes powdered rice hulls fully drench；Again
Compound is added, blank is made in stirring 5min；
2) blank is subjected to mechanical pressing under low pressure, briquetting pressure 3MPa, dwell time 10s, obtains base substrate；Will
Base substrate dries 18h at 110 DEG C, is then warming up to 1500 in the reducing atmosphere under the conditions of burying carbon with 3 DEG C/min speed
DEG C and be incubated 3h, produce.
Embodiment 3
Rice husk Quito hole silicon carbide ceramic material of the present embodiment, is prepared by rice husk, water and compound, compound
Quality is the 50% of rice husk quality；The compound is made up of the component of following mass percent：Silica flour 3%, anthracite 25%,
Graphene 8%, NaCl 6%, pulp powder 45%, polyvinyl butyral resin 13%；Raw material is taken to be mixed in ball mill mixing machine by proportioning
1h is closed, produces compound.
The preparation method of rice husk Quito hole silicon carbide ceramic material of the present embodiment, using following steps：
1) powdered rice hulls are added in mixer, adds the water of powdered rice hulls weight 55%, stirring makes powdered rice hulls fully drench；Again
Compound is added, blank is made in stirring 5min；
2) blank is subjected to mechanical pressing under low pressure, briquetting pressure 2MPa, dwell time 15s, obtains base substrate；Will
Base substrate dries 18h at 110 DEG C, is then warming up to 1450 in the reducing atmosphere under the conditions of burying carbon with 3 DEG C/min speed
DEG C and be incubated 3h, produce.
Embodiment 4
Rice husk Quito hole silicon carbide ceramic material of the present embodiment, is prepared by rice husk, water and compound, compound
Quality is the 30% of rice husk quality；The compound is made up of the component of following mass percent：Silica flour 22%, graphite 16%,
Phenol-formaldehyde resin powder 12%, NaF 7%, Zn 8%, gelatin 18%, polyvinyl butyral resin 17%；Raw material is taken in ball milling by proportioning
1h is mixed in batch mixer, produces compound.
The preparation method of rice husk Quito hole silicon carbide ceramic material of the present embodiment, using following steps：
1) powdered rice hulls are added in mixer, adds the water of powdered rice hulls weight 20%, stirring makes powdered rice hulls fully drench；Again
Compound is added, blank is made in stirring 5min；
2) blank is subjected to mechanical pressing under low pressure, briquetting pressure 0.5MPa, dwell time 30s, obtains base substrate；
Base substrate is dried into 12h at 110 DEG C, is then warming up in the reducing atmosphere under the conditions of burying carbon with 2.5 DEG C/min speed
1450 DEG C and 3h is incubated, produced.
Embodiment 5
Rice husk Quito hole silicon carbide ceramic material of the present embodiment, is prepared by rice husk, water and compound, compound
Quality is the 35% of rice husk quality；The compound is made up of the component of following mass percent：Silica flour 25%, pitch 35%,
FeCl35%, pulp powder 25%, carboxymethyl cellulose 5%, sodium carboxymethylcellulose 5%；Raw material is taken in ball mill mixing by proportioning
1h is mixed in machine, produces compound.
The preparation method of rice husk Quito hole silicon carbide ceramic material of the present embodiment, using following steps：
1) powdered rice hulls are added in mixer, adds the water of powdered rice hulls weight 80%, stirring makes powdered rice hulls fully drench；Again
Compound is added, blank is made in stirring 10min；
2) blank is subjected to mechanical pressing under low pressure, briquetting pressure 0.5MPa, dwell time 30s, obtains base substrate；
Base substrate is dried into 48h at 50 DEG C, is then warming up to 1300 in the reducing atmosphere under the conditions of burying carbon with 5 DEG C/min speed
DEG C and be incubated 5h, produce.
Test example 1
This test example detects the properties of rice husk Quito hole silicon carbide ceramic material obtained by each embodiment, as a result such as table 1
It is shown.
The performance test results of rice husk Quito hole silicon carbide ceramic material of 1 each embodiment of table
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Bulk density, gcm-3 | 0.7~0.9 | 1.2~1.3 | 1.0~1.1 | 0.5~0.6 | 0.6~0.7 |
| The porosity, % | 70.1~77.2 | 57.4~63.9 | 63.9~67.2 | 83.1~85.0 | 77.5~82.5 |
| Stomata average pore size, μm | 8.5~9.6 | 2.2~3.1 | 4.5~6.2 | 13.3~17.5 | 18.8~25.1 |
| Compressive resistance, MPa | 62.9~80.2 | 98.3~116.4 | 89.9~97.3 | 44.9~48.7 | 47.5~65.4 |
By rice husk Quito hole silicon carbide ceramic material of the results showed that present invention of table 1, air vent aperture is fine, puts down
Equal only 2.2~25.1 μm of aperture；Product volume density is relatively low, reaches 0.5~1.3gcm-3；The porosity is high, reach 57.4%~
85.0%；Mechanical strength is higher, and cold crushing strength is 44.9~116.4MPa；Temperature in use is high, can be normal at 1600 DEG C
Use.
Test example 2
The SEM of carborundum is schemed as shown in figure 1, the institute of embodiment 2 in the gained rice husk Quito hole silicon carbide ceramic material of embodiment 1
The SEM figures for obtaining carborundum in the hole silicon carbide ceramic material of rice husk Quito are as shown in Figure 2.
From Fig. 1 and Fig. 2, resulting product situ of the present invention generates the carborundum of a large amount of threadinesss or crystal whisker-shaped,
Strengthening and Toughening is served to matrix, makes product that there is higher mechanical strength；Generated in-situ SiC fibers or whisker are woven into network
Structure, more Minute pores also be present in this network, remain original micro-pore structure in rice husk in product in addition, the two is common
Same-action, make product that there is multistage air hole structure, multimodal feature is presented in pore-size distribution, and product has stronger filtering and energy of adsorption
Power.In addition, the size of stomata and its microscopic appearance can be made up of feed change in product, firing temperature and briquetting pressure etc. are entered
Row Effective Regulation.
Claims (9)
- A kind of 1. rice husk Quito hole silicon carbide ceramic material, it is characterised in that mainly it is made up of rice husk and compound, compound Quality is the 30%~70% of rice husk quality；The compound is made up of the component of following mass percent：Silica flour 1%~30%, carbon Source 5%~40%, catalyst 1%~15%, bonding agent 30%~75%；Its preparation method comprises the following steps：1）Powdered rice hulls are mixed with water, compound is added and is well mixed, blank is made；2）Blank is molded base substrate is made, after body drying, burnt till, produce in 1300~1500 DEG C in reducing atmosphere；It is described be shaped to it is compressing；Described reducing atmosphere is to bury the reducing atmosphere under the conditions of carbon；The bonding agent is dextrine powder, pulp powder, carboxymethyl cellulose, sodium carboxymethylcellulose, polyvinyl butyral resin, gelatin In one kind or combination.
- 2. rice husk Quito hole silicon carbide ceramic material as claimed in claim 1, it is characterised in that the carbon source is carbon black, stone One kind or combination in ink, graphene, phenol-formaldehyde resin powder, anthracite, coke or pitch.
- 3. rice husk Quito hole silicon carbide ceramic material as claimed in claim 1, it is characterised in that the catalyst be NaCl, NaF、Zn、Fe、FeCl3、Fe2O3In one kind or combination.
- A kind of 4. preparation method of rice husk Quito as claimed in claim 1 hole silicon carbide ceramic material, it is characterised in that including Following steps：1）Powdered rice hulls are mixed with water, compound is added and is well mixed, blank is made；2）Blank is molded base substrate is made, after body drying, burnt till, produce in 1300~1500 DEG C in reducing atmosphere；It is described be shaped to it is compressing；Described reducing atmosphere is to bury the reducing atmosphere under the conditions of carbon.
- 5. preparation method as claimed in claim 4, it is characterised in that step 1）In, average grain diameter≤75 μm of powdered rice hulls；It is mixed Close in material, average grain diameter≤75 μm of silica flour, average grain diameter≤75 μm of carbon source, average grain diameter≤45 μm of catalyst.
- 6. preparation method as claimed in claim 4, it is characterised in that step 1）In, the dosage of water is the 20% of powdered rice hulls weight ~200%.
- 7. preparation method as claimed in claim 4, it is characterised in that step 2）In, the pressure of shaping is 0.5~3MPa, is protected The time of pressure is 10~30s.
- 8. preparation method as claimed in claim 4, it is characterised in that step 2）In, the temperature of the drying is 50~110 DEG C, the dry time is 12~48h.
- 9. preparation method as claimed in claim 4, it is characterised in that step 2）In, it is warming up to 2~5 DEG C/min speed 1300~1500 DEG C, be 3~5h in the time of firing temperature insulation.
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| CN1064062A (en) * | 1992-03-20 | 1992-09-02 | 徐以达 | With rice husk, rice straw is the method for raw material preparing silicon carbide |
| CN102351564A (en) * | 2011-07-20 | 2012-02-15 | 福州大学 | Method for preparing wood ceramics by sintering coal tar pitch and biomass materials |
| CN102485694A (en) * | 2010-12-02 | 2012-06-06 | 徐宏武 | Method for preparing beta-SiC and powder thereof from coal ash |
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| JPH0826848A (en) * | 1994-07-21 | 1996-01-30 | Tokai Carbon Co Ltd | Production of porous sic molding |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1064062A (en) * | 1992-03-20 | 1992-09-02 | 徐以达 | With rice husk, rice straw is the method for raw material preparing silicon carbide |
| CN102485694A (en) * | 2010-12-02 | 2012-06-06 | 徐宏武 | Method for preparing beta-SiC and powder thereof from coal ash |
| CN102351564A (en) * | 2011-07-20 | 2012-02-15 | 福州大学 | Method for preparing wood ceramics by sintering coal tar pitch and biomass materials |
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